The best way to answer of this question is to convince them by giving the examples of your skills and worthiness why you are the best candidate for the job. Compare the job description with your abilities before them, as well as also mentioned what you have accomplished in your other positions. Be positive and attracts their attention towards your ability, your experience, and your energy. Also show your interest in the company and the position.
Sometimes the interviewer is not convinced about your purpose for applying this job. Generally the interviewer wants to know how long this person will stay with them. And if the purpose is not clear then the interviewer may get an impression that you are not looking for a permanent job and you will leave the organization soon.
For answering this question, you have to define yourself as the eligible and best candidate on the behalf of your experience and qualities needed for the job. Also mentioned that you the company have an excellent image and you want to work for an organization like it. You can do your best and enjoy a lot while working for this company.
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